问题 问答题 简答题

奶类及奶制品有哪些营养特点

答案

参考答案:(1)奶类:A、蛋白质含量为3-4%,消化吸收率为87-89%,其必需氨基酸含量与组成和鸡蛋相似,利用率高,属于优质蛋白,牛奶中酪蛋白与白蛋白的构成比与人奶恰好相反;B、脂肪含量3-5%,颗粒小,消化吸收率高;C、所含碳水化合物为乳糖(4-5%),其含量较人奶低,促进肠内乳酸菌生长,还可以促进钙和无机盐的吸收;D、是矿物质的丰富来源,以钙、磷、钾为多,但含铁量不足;E、含有人体需要的各种维生素,其中维A和维C含量与动物饲料和季节有关。

(2)奶制品:A、奶粉。全脂奶粉溶解性良好,对蛋白质的性质、奶的色香味及其他营养成分影响均很小,脂肪含量在26%左右,适合于普通人群食用;脱脂奶粉是一种高蛋白低脂肪的营养食品,适合于老年人及肥胖、高血脂人群食用;配方奶粉对牛奶的营养的组成成分加以适当调整和改善,使之更适合于婴幼儿、孕妇、中老年人。B、酸奶。保留牛奶全部营养成分,且蛋白质、脂肪变得更易消化;钙、磷、铁利用率大大提高;乳酸可抑制肠道内病菌繁殖,增进食欲,促进胃肠蠕动;维持肠道内菌丛的平衡,增加有益菌群,抑制腐败菌。C、炼乳。含糖量高(40%以上),加水稀释后蛋白质和维生素、无机盐等其他营养素的含量相对较低,故不适合喂养婴儿,但适用于长途旅行者或野外工作者。D、奶油。含脂肪80%以上,含水量低于16%,主要用于佐餐和面包、糕点的制作。

完形填空
完形填空。
     The computer is a very wonderful machine today, and it's so   1   that it seems that we   2   live or work
without it. Computers are used in many   3  , such as offices, factories, big shops, schools and even homes.
With the computer people are living a better   4  .
     The computer is one of the greatest inventions in the   5   century. The first computer was built in America
in 1945 which was named ENIAC, and it was not only very   6  , but also quite heavy. It was as big as ten
ordinary (普通的) rooms!
     But the computer is developing very fast. Today they're becoming smaller and smaller, lighter and lighter, and
  7   faster and faster. There are so many kinds of different computers in the market that you can choose one
that you like best.
     The computer can do a lot of things for people, and it also helps us to learn about the real world. With the
computer you can   8   an e-mail just in a few seconds to your friend far away, but if you post the letter, it will
take your friend quite a long time to receive your   9  .
     Now you can see the computer really gives us a very nice picture about the world of tomorrow. So as a
student in the 21st century, you have to work hard and learn how to   10   the computer very well. Don't you
think so?
( ) 1. A. beautiful  
(     ) 2. A. can        
(     ) 3. A. roads      
(     ) 4. A. life      
(     ) 5. A. 18th      
(     ) 6. A. useful    
(     ) 7. A. studying  
(     ) 8. A. give      
(     ) 9. A. letter    
(     ) 10. A. get        
B. interesting  
B. can’t        
B. streets      
B. friend        
B. 19th          
B. large        
B. teaching        
B. take          
B. book          
B. use        
C. useful    
C. must      
C. crossings  
C. family    
C. 20th      
C. small      
C. walking        
C. post      
C. help      
C. read    
D. enjoyable    
D. mustn’t     
D. places       
D. country      
D. 21st         
D. cheap        
D. working            
D. send         
D. message      
D. write      
名词解释